Cyber Threat Specialist (Penetration Tester) in London

This role is an entry-level position within the Information Security team at the London Metal Exchange (LME). This role will be a junior member of the penetration testing team to conduct penetration testing of LME systems and applications. Penetration testing will include scoping, performing assessments, identifying vulnerabilities, documenting technical exploitation steps, and providing recommendations and remediations.

The successful candidate will work closely with IT Engineering, Security Operations, and Infrastructure teams to ensure that security controls are effectively implemented and maintained across LME's platforms.

• Participate in offensive assessments (red team, penetration testing, breach and attack simulation, bug bounty) and defensive security operations (threat hunting, incident handling, investigation and forensics, detection engineering) for LME systems and infrastructure.
• Support security incidents and act as stretch capacity for incident response and threat handling; participate with on-call duties and after-hours support of incident management for incident escalations.
• Participate in Red/Blue Team testing, identify gaps/weaknesses in monitoring capabilities and recommend/implement changes.
• Review intelligence feeds and generate advisories as needed. Stay up-to-date with current and emerging trends that represent a threat to LME.
• Support threat hunting based on the defined threat model and specific attack scenarios. Perform analysis of existing data to discover patterns, and build use cases to detect malicious activity.
• Optimise detection and response rules; support the testing and recertify SIEM rules against threat models and detection frameworks.
• Assist in the deployment and maintenance of security tools and platforms (e.g., E-Mail Security, DLP, SIEM, Endpoint Protection).
• Develop and support the automation of security tools, configuration, and updates using scripting (e.g., Python, PowerShell, Bash, NPM).
• Contribute to Infrastructure as Code (IaC) efforts using Terraform or Ansible.
• Help monitor and maintain secure configurations across Windows, Linux, and Kubernetes environments.
• Provide support for incident response and troubleshooting related to security tooling and access controls.
• Provide support for Red/Blue team testing and penetration testing.
• Help maintain documentation, standards, and procedures related to security engineering and platform protection.
• Participate in on-call and weekend support rotations as needed.

• Desirable: A University degree or equivalent qualifications in a STEM subject such as Computer Science, or Engineering and/or Information Systems.
• Desirable: Entry-level certifications such as CompTIA Security+, Microsoft SC-900, or AWS Cloud Practitioner.
• Activity on TryHackMe, HackTheBox, and OSCP-related / Red Team training (or some equivalent the named platforms).
• Demonstrable activity on Github showing code, tools development, and/or contributing to projects and repos in the offensive security space.

• Up to 2 years of experience in IT, security engineering, or DevOps (internships or academic projects included).
• Basic understanding of:

• Ethical Hacking & Penetration Testing
• Networking and security protocols (TCP/IP, HTTPS, DNS, Firewalls, Proxy)
• Operating systems (Windows, Linux/Unix, Kubernetes)
• Scripting or programming (Python, Bash, PowerShell)
• CI/CD tools and cloud platforms (e.g., Ansible Tower, Bitbucket, Hashicorp Vault, Pipelines, AWS, Azure)
• Working knowledge of SDLC
• Security Tooling (e.g., EDR, SIEM, Antivirus)

• Curiosity about emerging threats and technologies
• Ability to assess and prioritize tasks/risks
• Attention to detail
• Enthusiastic about security engineering and automation.
• Strong analytical and problem solving skills.
• Effective communicator with good documentation habits.
• Team‐oriented, proactive, and adaptable in a fast‐paced environment.
• Willingness to learn and grow within a critical infrastructure environment.
• Commitment to continuous learning.

The LME is committed to creating a diverse environment and is proud to be an equal‐opportunity employer. In recruiting for our teams, we welcome the unique contributions that you can bring in terms of education, ethnicity, race, sex, gender identity, expression and reassignment, nation of origin, age, languages spoken, colour, religion, disability, sexual orientation and beliefs. In doing so, we want every LME employee to feel our commitment to showing respect for all and encouraging open collaboration and communication.